This module of the Retroreflectivity for Sign Inspectors Course is for any inspector using Visual Nighttime Inspection with the Comparison Panels Procedure. It provides options for obtaining and using comparison panels to properly conduct a nighttime inspection using this procedure. The module explains how to use Table 2A-3 of the MUTCD to select the appropriate comparison panel for each sign and why that is important to meeting the standard. It also teaches documentation of the inspection. R101 and S101 are prerequisites for this module.